u only ned 2 on a fowlr tank and they cost nothing to run and no heat in tank
Try not to complicate things and make things more expensive then what they need to be. You dont need strong lighting like what comes from ai and you dont need extreme flow like what comes from a mp60. You dont need a deep sand bed or a calcium reactor. All you need is fish some steady flow and light to make it enjoyable to view
You don't need to go crazy but there is still the issue of "you get what you pay for". Good LEDs that will last at least close to their advertised life expectancy will cost more up front but will cost far less over time. It really doesn't matter for a FOWLR unless you want to keep the rocks looking good along with the fish. Otherwise it's just what makes the fish look good. If you're handy, you could gut the ATI unit and spread the bulb units out so you have 3 touching each end in the canopy. Would be the least expensive option since you already have all the parts right there.